Financial Independence Calc app for iPhone and iPad
With the Financial Independence Calculator you can find out how long you have to save until you are financially free.
Just enter some data about income, spendings and your current savings and this app will calculate how long you need to keep this income until you can retire or do whatever you want.
You also get nice charts and tables with your available savings for each year.
Terms of service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/